| Patents for William Porteous |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 427,902 | May 13, 1890 | W. Porteous | Lathe Tool | lathe tool holders and tool posts |
| 427,903 | May 13, 1890 | W. Porteous | Automatic Screw Cutting Die | tap and die holders |
| 756,405 | Apr. 05, 1904 | W. Porteous | Milling-Machine | milling machines |
| 852,346 | Apr. 30, 1907 | W. Porteous | Milling-Machine | milling machines |
| 867,076 | Sep. 24, 1907 | W. Porteous | Horizontal Reaming, Tapping, and Facing Machine | tapping machines |
| 867,077 | Sep. 24, 1907 | W. Porteous | Reaming and Tapping Machine | tapping machines |
